Preparation of (R)-2-azidoesters from 2-((p-nitrobenzene)sulfonyl)oxy esters and their use as protected amino acid equivalents for the synthesis of di- and tripeptides containing D-amino acid constituents
作者:Robert V. Hoffman、Hwa-Ok Kim
DOI:10.1016/s0040-4020(01)92245-8
日期:1992.4
(R)-2-Azidoesters and their derived (R)-2-azido acids are readily prepared from common aminoacids by an inversion methodology that employs (S)-2-nosyloxyesters as key intermediates. The (R)-2- azidoesters can be used as protected aminoacid equivalents in peptide synthesis. Basic hydrolysis frees the carboxyl group. Triphenylphosphine/water is used to free the amine group. By these reactions a variety